एपीए उद्धरण

National productivity council. (1965). Refractories industry in USA, Britain and West Germany. National productivity council.

शिकागो स्टाइल उद्धरण

National productivity council. Refractories Industry in USA, Britain and West Germany. New Delhi: National productivity council, 1965.

एमएलए उद्धरण

National productivity council. Refractories Industry in USA, Britain and West Germany. National productivity council, 1965.